JPS59148904A - Computer control device - Google Patents

Abstract

PURPOSE:To make operation for design and tests efficient by providing the titled device with a calculation simulator recognizing and finding simultaneous equations from a numerical formula model group for independent apparatus and its external convertion table. CONSTITUTION:A plant apparatus group 5 is controlled by a control variable 10 of an operator 4 receiving a control signal 9 from the calculation control device 1 and a detector 6 detects an output 11 from the plant apparatus group 5. The detecting signal 12 of the detector 6 is compared with a set value signal 7 and a control signal 9 is formed on the basis of the deviation 8. The calculation control device 1 includes the calculation simuator 14 and numerical formula models A1-C1 and external data a1-c1 corresponding to the numerical formula models A1-C1 while being controlled independently are stored in a storage device 15 of the simulator 14 in each constitutional element. The simulator 14 is provided with a control device 14a connecting the numerical formula models A1-C1 while referring the external data a1-c1 and recognizing as a simultaneous equation and an answering device 14b answering the simultaneous equation to store the simulated results a1'-c1' for every simulation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a computer control device, and particularly to a computer control device suitable for achieving optimized operation of plant equipment.

[Prior art]

Control of plant equipment is broadly divided into sequence control, which specifies operating procedures, and transient control, which defines transient operations of equipment that constitutes plant equipment.

The latter uses analog control and
Divided into digital control.

With the development of digital computers, conventional mechanical, hydraulic/pneumatic, and electrical analog control devices have almost been replaced by digital control devices using microprocessors and the like. However, most of this digitization is done by using a conventional analog control device, selecting a signal sampling time so short that it can be regarded as the same as an analog signal, and replacing it with calculations by a digital computer. This is because we place emphasis on making it easy for drivers accustomed to conventional analog control devices to understand and make adjustments on-site.

In large-scale plant control devices, a system is often adopted in which the control device is divided into parts according to functional purposes, and the partial control devices are integrated by a higher-level control device. FIG. 1 shows a control system diagram of such a known technique.

The calculation control device 1 consists of a controller 2 and a control logic storage device 3. The components of the system are an operating device 4, plant equipment 5,
There may be a plurality of detectors 6. The signals exchanged within the system are a control signal 9, a manipulated variable 10, a plant equipment output 11, and a detection signal 12.To make it clear that there are multiple components and signals, the signal lines are It is shown by a line. Depending on the energy plant or chemical plant that is subject to computational control, the number of plant equipment 5 may be 100 or more, the number of controllers 4 may be 200 or more, and the number of detectors 6 may be 500 or more. The control logic held is stored in tabular form.

The purpose of this known technique is as follows.

(1) Aiming at complete automation of a specific plant system (for example, a large thermal power plant).

(2) However, the operating technology to achieve this purpose (plant component equipment 5, control operator 4, calculation control device 1, detector 6)
Achieve item (1) under conditions where sufficient design technology, operational data, operational know-how, etc.) have been accumulated.

(3) As mentioned above, in order to input a large amount of data to the calculation control device 1, fixed data 7 oz tf is used to ensure reliable and easy input.

(4) Data related to control is verified in advance using a separate computer that can simulate the plant equipment 5, control operator 4, and detector 6 to ensure on-site settings.

In the known technology, in accordance with the above-mentioned purpose, it is necessary to define all control variables for each aspect of operation control such as plant startup, load change, and shutdown. In addition, even if better data on equipment characteristics is obtained during operation, we can respond flexibly to it.
It is a fixed thing that is difficult to improve. in general,
In such a large-scale plant, the ultimate goal of automation and optimization can be achieved by constructing the entire system without sufficient experience with the components and controllers and gaining operational experience. There are many. Furthermore, in the planning stage of a control device, even if sufficient knowledge is not obtained, it is necessary to simulate the system operation with the aid of a computer and verify it in advance.

In this case, it is necessary to incorporate operational results and the results of element tests conducted after planning into the equipment model as needed to improve the system model. Conventionally, no consideration has been given to such successive improvements or partial improvements.

[Purpose of the invention]

The purpose of the present invention is to improve the above-mentioned conventional drawbacks, and to provide a computer control device that controls multi-variable plant equipment, in particular, in the planning and operation adjustment stages when aiming at automation and optimization. The object of the present invention is to provide a calculation control device that can realize a control method verified by calculation simulation.

[Summary of the invention]

In order to achieve the above object, the present invention provides a calculation control device having a signal detection device, a storage device, an arithmetic processing device, and a control operation device, in which independent mathematical model groups and portrait mathematical model groups of component devices are connected. A calculation simulation device is provided, which has an external variable table that is managed independently in correspondence, a management device that connects the mathematical formula model group and the external variable table and recognizes it as a simultaneous equation, and a solution device that solves the simultaneous equation. It is characterized by

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a control system diagram according to an embodiment of the present invention.

In the entire system, a plant equipment group 5 is controlled by a control amount 10 of an operating device 4 that receives a control signal 9 from a calculation control device 1, its output 11 is detected by a detector 6, and a detection signal 12 is returned. A feedback control system is shown in which the calculation control device 1 compares the set value signal 7. By comparing the detection signal 12 and the set value signal 7, a deviation signal 8'f: is outputted, and a control signal 9 is generated based on the deviation signal 8.

The calculation control device 1 includes a calculation simulation device 14, and the storage device 15 stores a mathematical model klp A2 for each component.
H...Bl r Ct l...
and external data a+ l B21 ・”-”bt * Ct that is managed independently in correspondence with the mathematical formula model.
+...””If: Keep it. External data al,
C3,...I)t*'lH...
...is the mathematical model AHg A2 H...B,
, ct.

Input/output data and mathematical model AI HA
2 + . . . Bl + CI + .

The calculation simulation device 14 includes external data aI + B2 +
・・・・・・Refer to bl l cll・・・・・・ Formula model A1゜kg ,・・・・・・Bt + Ct
A management device 14JI that connects +... and recognizes them as simultaneous equations, and a solving device 14b that solves these simultaneous equations are at least provided.

The calculated results are simulated and the results are all B2 *9
00. "l)1 + 01"00. , + 31' *
aI + 000. "l)1' *C1/...
・It is memorized as follows. At the time of planning, the operating device 4, plant equipment group 5, and detector 6 of the actual plant are provided as a mathematical model, and the entire system is simulated by computer. Depending on the control situation, the components described by the mathematical model may need to be simulated by the calculation mechanism (7) in different combinations, and in such cases, the management device 14a
Manage external data by. Furthermore, if new knowledge is obtained about the component equipment during the planning stage or operation stage, the mathematical model is improved and newly defined, saved in the storage device 15 as, for example, A s 1, and transferred to the AI. and use it.

Next, the handling of the mathematical model and external data will be explained with reference to FIG. Formula model A11 A2 HB11C1l・
... consists of a mathematical formula and an input/output section. The input/output unit determines the number of data to be used as data for calculation and the number of output to output the calculation result.

The array at both ends of the mathematical model A10 shows that the outer ends are input/output order indicators, and the inner ones are variables used internally, connected by equal signs.

Mathematical models AI, A4, B1. When connecting Ct, use external variables aot, “”” aOn l
a11H+"" al11+... are added to each mathematical model so as to correspond to the input/output order. Between the mathematical models A1 and A2, for example, as shown in Figure 3, the connection relationship between the first output of A1 and the first input of A2 is defined by all(8), and the third output of AI The fifth connection relationship between the input of A2 and the input of A2 is defined by aIn. If you do not need any connection and only want to output the calculation results, for example,
It is sufficient to allocate 82n external data to only the output of No.2. External data ao1...e, sl as mathematical model A1
By placing it in C1, a group of equations that describe the entire system can be defined.

In this way, independent mathematical models can be saved and the entire mathematical model can be configured using external data, making it possible to flexibly and reliably modify or replace individual mathematical models and change the configuration, compared to conventional methods using fixed models. can be executed, reducing the effort required to simulate calculations.

The management device 14a shown in FIG. 2 manages connection relationships and formula model names. The solving device 14b recognizes the mathematical model group as a simultaneous equation, solves it, and sends the result to the management device 1.
Give to external data of 4a.

According to the definition, al * aZ + b for each mathematical model
*, Ct...... are stored. As is clear from FIG. 3, what is used to define the connection relationship is shared by the connected mathematical models, so (9) the memory arrays do not overlap.

The system diagram shown in FIG. 2 shows a situation where the system is used in combination with an actual plant and a control device. In this case, it is also possible to carry out a partial simulation in which the logic input/outputs 8 and 9 of the calculation control device 1 and the detection signal 12 are taken in from the actual system side and used for comparison with the mathematical model or directly used as input data for the mathematical model.

On the other hand, in the planning stage when the hardware is not prepared,
The logical processing executed by the controller 2 is expressed by a mathematical model, and together with the mathematical models of other devices, the entire system is configured to simulate calculations. At the testing stage when the calculation control device 1 is manufactured, the development effort during planning and inspection can be reduced by using a combination of the actual calculation control device and calculation simulation to verify the control method.

FIG. 4 shows a diagram on a graphic processing display terminal device for input/output.
All models are displayed as physical images of the target plant. 5a, 5b, 5C are plant equipment, 1
a+ lb, IC indicates a calculation control unit.

(10) This graphic processing display terminal device has 5a and 5b corresponding to the mathematical models shown in FIGS. 2 and 3.

By defining symbols of plant equipment such as 50, operating data of the actual plant can be displayed as numerical data or graphical data. Furthermore, by displaying the result data of calculation simulation using a mathematical model, it is also possible to effectively present numerical data that is difficult to judge as intuitive graphical data.

Blocks containing plant equipment symbols, fluid flows, and signal flows correspond to the connection configurations based on the mathematical model and external data described above, so there may be a discrepancy between the mathematical model being calculated and the display on the screen. Never.

By using the graphic processing display terminal device in this way,
This has the effect of making it easier for users, such as planners and operators of the plant, to understand the model configuration and numerical input for calculation simulation that can be understood within a computer, and making it difficult for mistakes and confusion to occur. In addition, the display output of the results of calculation simulations provides a sense of realism as if an actual plant exists and is being operated at the location (11), appeals to intuitive judgment, and displays a large number of physical contents. Since different data can be presented in a simple manner, it has the effect of significantly improving the efficiency of planning work and operation adjustment work.

〔Effect of the invention〕

As explained above, according to the present invention, when aiming at automation or optimization, especially in a calculation control device that executes control of multi-variable plant equipment, it is possible to verify by calculation simulation at the planning and operation adjustment stage. A control method can be realized.

[Brief explanation of drawings]

Fig. 1 is a control system diagram of a conventional calculation control device, Fig. 2 is a control system diagram of a calculation control device in an embodiment of the present invention, and Fig. 3 explains a model configuration method in an embodiment of the present invention. FIG. 4 is a diagram showing an example of a display of a graphic processing display terminal device in an embodiment of the present invention. 1... Calculation control device, 2... Controller (group), 4...
・Operator (group), 5...Plant component equipment (group), 6
...Detector, 14...Calculation simulation device, 14a...
Calculation simulation tube (12)

Claims (1)

[Claims] 1. In a calculation control device having a signal detection device, a storage device, an arithmetic processing device, and a control operation device, a correspondence is established between an independent mathematical model group of each component device and the mathematical model group. A calculation simulation device is provided, which has an external variable table that is managed independently, a management device that connects the external variable table and the mathematical model group and recognizes it as a simultaneous equation, and a solution device that solves the simultaneous equation. A calculation control device characterized by: 2. The calculation control device according to claim 1, wherein the calculation simulation device includes a graphic processing display terminal device M for input/output to the calculation simulation device.